where to get oyster card

{"cid":"91169521","title":"Oyster Card Holder, PVC Card Wallet","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/d9\/db\/11b6e97da4b6654ecf8f440e185e-200x200-1.jpg","attrs":{"Price":"USD0.09-0.19","Brand Name":"SeabreezeRFID","Model Number":"FT-106","Minimum Order Quantity":"1000pcs","Delivery Time":"Asap","Place of Origin":"China Mainland","Certification":"RoHS","Add time :":"2014-01-18 20:26:59","Packaging Details":"100pcs\/Opp bag,1000pcs\/export carton","Payment Terms":"L\/C, T\/T, Western Union, PayPal","Supply Ability":"500,000pcs\/month or Specify the number","Sample :":"Free (If you pay the express charge,Or if you hereafter have goods orders, return the express charge"}}

{"cid":"91185608","title":"CR80 Size Silicone Business Card Soft PVC Card Case \/ Vertical Card Holder","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/d8\/8f\/06ad99240ea485795c093cc07033-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"CNJACKY","Model Number":"Card Holder","Minimum Order Quantity":"1 Unit","Delivery Time":"1-7 days after payment","Certification":"ISO","Place of Origin":"Hubei, China","Payment Terms":"L\/C,D\/A,D\/P,T\/T,Western Union,MoneyGram,PayPal","Supply Ability":"10000 Units\/Week","Packaging Details":"Standard export carton packaging","Size":"can be customized","Color":"Customized","Logo":"Customized Logo","Usage":"Office,School,etc","Function":"Protecting","Feature":"Eco-Friendly"}}